<template>
  <div class="panel-tab__content">
    <el-form :model="flowConditionForm"
      label-width="90px"
      @submit.prevent>
      <el-form-item label="流转类型">
        <el-select v-model="flowConditionForm.type"
          @change="updateFlowType">
          <el-option label="普通流转路径"
            value="normal" />
          <el-option label="默认流转路径"
            value="default" />
          <el-option label="条件流转路径"
            value="condition" />
        </el-select>
      </el-form-item>
      <el-form-item label="条件格式"
        v-if="flowConditionForm.type === 'condition'"
        key="condition">
        <el-select v-model="flowConditionForm.conditionType">
          <el-option label="表达式"
            value="expression" />
          <el-option label="脚本"
            value="script" />
        </el-select>
      </el-form-item>
      <el-form-item label="表达式"
        v-if="flowConditionForm.conditionType && flowConditionForm.conditionType === 'expression'"
        key="express">
        <el-input v-model="flowConditionForm.body"
          clearable
          @change="updateFlowCondition" />
      </el-form-item>
      <template v-if="flowConditionForm.conditionType && flowConditionForm.conditionType === 'script'">
        <el-form-item label="脚本语言"
          key="language">
          <el-input v-model="flowConditionForm.language"
            clearable
            @change="updateFlowCondition" />
        </el-form-item>
        <el-form-item label="脚本类型"
          key="scriptType">
          <el-select v-model="flowConditionForm.scriptType">
            <el-option label="内联脚本"
              value="inlineScript" />
            <el-option label="外部脚本"
              value="externalScript" />
          </el-select>
        </el-form-item>
        <el-form-item label="脚本"
          v-if="flowConditionForm.scriptType === 'inlineScript'"
          key="body">
          <el-input v-model="flowConditionForm.body"
            type="textarea"
            clearable
            @change="updateFlowCondition" />
        </el-form-item>
        <el-form-item label="资源地址"
          v-if="flowConditionForm.scriptType === 'externalScript'"
          key="resource">
          <el-input v-model="flowConditionForm.resource"
            clearable
            @change="updateFlowCondition" />
        </el-form-item>
      </template>
    </el-form>
  </div>
</template>

<script>
export default {
  name: 'FlowCondition',
  props: {
    businessObject: Object,
    type: String
  },
  data() {
    return {
      flowConditionForm: {}
    };
  },
  watch: {
    businessObject: {
      immediate: true,
      handler() {
        this.$nextTick(() => this.resetFlowCondition());
      }
    }
  },
  methods: {
    resetFlowCondition() {
      this.bpmnElement = window.bpmnInstances.bpmnElement;
      this.bpmnElementSource = this.bpmnElement.source;
      this.bpmnElementSourceRef = this.bpmnElement.businessObject.sourceRef;
      if (this.bpmnElementSourceRef && this.bpmnElementSourceRef.default && this.bpmnElementSourceRef.default.id === this.bpmnElement.id) {
        // 默认
        this.flowConditionForm = { type: 'default' };
      } else if (!this.bpmnElement.businessObject.conditionExpression) {
        // 普通
        this.flowConditionForm = { type: 'normal' };
      } else {
        // 带条件
        const conditionExpression = this.bpmnElement.businessObject.conditionExpression;
        this.flowConditionForm = { ...conditionExpression, type: 'condition' };
        // resource 可直接标识 是否是外部资源脚本
        if (this.flowConditionForm.resource) {
          this.flowConditionForm['conditionType'] = 'script'
          this.flowConditionForm['scriptType'] = 'externalScript'
          return;
        }
        if (conditionExpression.language) {
          this.flowConditionForm['conditionType'] = 'script'
          this.flowConditionForm['scriptType'] = 'inlineScript'
          return;
        }
        this.flowConditionForm['conditionType'] = 'expression'
      }
    },
    updateFlowType(flowType) {
      // 正常条件类
      if (flowType === 'condition') {
        this.flowConditionRef = window.bpmnInstances.moddle.create('bpmn:FormalExpression');
        window.bpmnInstances.modeling.updateProperties(this.bpmnElement, {
          conditionExpression: this.flowConditionRef
        });
        return;
      }
      // 默认路径
      if (flowType === 'default') {
        window.bpmnInstances.modeling.updateProperties(this.bpmnElement, {
          conditionExpression: null
        });
        window.bpmnInstances.modeling.updateProperties(this.bpmnElementSource, {
          default: this.bpmnElement
        });
        return;
      }
      // 正常路径，如果来源节点的默认路径是当前连线时，清除父元素的默认路径配置
      if (this.bpmnElementSourceRef.default && this.bpmnElementSourceRef.default.id === this.bpmnElement.id) {
        window.bpmnInstances.modeling.updateProperties(this.bpmnElementSource, {
          default: null
        });
      }
      window.bpmnInstances.modeling.updateProperties(this.bpmnElement, {
        conditionExpression: null
      });
    },
    updateFlowCondition() {
      const { conditionType, scriptType, body, resource, language } = this.flowConditionForm;
      let condition;
      if (conditionType === 'expression') {
        condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', { body });
      } else {
        if (scriptType === 'inlineScript') {
          condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', { body, language });
          this.flowConditionForm['resource'] = ''
        } else {
          this.flowConditionForm['body'] = ''
          condition = window.bpmnInstances.moddle.create('bpmn:FormalExpression', { resource, language });
        }
      }
      window.bpmnInstances.modeling.updateProperties(this.bpmnElement, { conditionExpression: condition });
    }
  },
  beforeUnmount() {
    this.bpmnElement = null;
    this.bpmnElementSource = null;
    this.bpmnElementSourceRef = null;
  }
};
</script>
